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I need a really simple explanation on the workings of rear brake cylinders.
Q1. When using Hr front disc boosted what cylinders do I use for the rear if the rear is not boosted?
Q2. When boosting the front disc and back drum what rear cylinders do I use?
Trev .

Trev wrote:I need a really simple explanation on the workings of rear brake cylinders.
Q1. When using Hr front disc boosted what cylinders do I use for the rear if the rear is not boosted?
Q2. When boosting the front disc and back drum what rear cylinders do I use?
Trev .

If the rear is not boosted then drum brake front rear cylinders can be used and if boosting front and rear the smaller bore disc front rear cylinders are used.

Yep - the "boosted" rear cylinders are 9/16" bore.

frats,
Rosco

Asked the same question to Terry at Hydroboost about a year ago and he also said to use the HD/HR rear wheel cylinders applicable to a drum braked front end if using a front boosted only HR disc front end.